Comment 46 for bug 366651

It seems to me that I have exactly the same problem. I have just updated to ubtuntu 10.04.

I'm using a dell inspiron 6400 with an ati x1400 and open source driver. As Seth Chandler I'm posting the output of xrandr --prop

Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
 load detection: 1 (0x00000001) range: (0,1)
LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm
 EDID:
  00ffffffffffff004ca3000000000000
  00100103802115780a87f594574f8c27
  27505400000001010101010101010101
  010101010101c71b00a0502017303020
  26004bcf100000190000000f00000000
  00000000002387026400000000fe0044
  463035360331353458330a20000000fe
  002740505a81b0d9ff01010a2020009d
 scaling mode: Full
  supported: None Full Center Full aspect
   1280x800 60.0*+
   1280x720 59.9
   1152x768 59.8
   1024x768 59.9
   800x600 59.9
   848x480 59.7
   720x480 59.7
   640x480 59.4
S-video disconnected (normal left inverted right x axis y axis)
 tv standard: ntsc
  supported: ntsc pal pal-m pal-60
             ntsc-j scart-pal pal-cn secam
 load detection: 1 (0x00000001) range: (0,1)